Other operators in the past have been Brymon to Gatwick with a Twin Otter and BMA with a DHC7 to Heathrow. These were all before the days of the M40 which as mentioned is now only 1.5 hours by road so not really worth it.

London to Birmingham is simply too close to warrant a flight. BA thought about a LHR-BHX flight, but to use any plane on that route, even a J31/41 would be uneconomical. Flight time would be less than 20 minutes.

It can be a pain in the ass to drive from the midlands to London, but you have to make do with those giant car parks, M1/M25.